Minimum font size for seniors: Sites that target seniors should use at least 12-point type as the default. And all sites, whether or not they specifically target seniors, should let users increase text size as desired-- especially if the site opts for a smaller default font size.

Terminology and texts for seniors: Present technical information in a non-technical way that is easy to read and understand. Present information messages (and error messages) clearly, and in a nonthreatening way. Carefully consider whether using Web terms in your text is necessary.